Analytical Models for Guideway Surface Irregularities and Terrain Smoothing.

摘要

The report relates to the analytical modeling of guideway irregularities. A design criteria for determining the degree of leveling and filling of the natural terrain in order to achieve a particular power spectral density (PSD) specification is formulated and presented. An analytical model for the PSD of short wavelength surface roughness type irregularities is derived and interpreted in terms of familiar surface roughness measurement techniques. The procedure for relating a PSD design specification to an equivalent California profile index is presented in addition to the procedure for interpreting measurements of guideway profile deviations from a straight edge. Examples are presented demonstrating typical applications of the results. Numerical simulations incorporating random numbers for formulating typical guideway profiles are used to verify the analytical model. Excellent agreement between the analytical and numerical results are demonstrated.